Tuesday, August 30, 2016

Changing your seller name on Apple's App Store is not a straight-forward process. There are several caveats and ways to accomplish a name change. In the absence of any formal process, here are two methods for changing your seller name.

A good video to explain the process of transferring application us here

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Monday, August 29, 2016

Localizing iOS apps with the standard tools is tedious, especially when you use Interface Builder files. To resolve that, I have created a new tool called AGi18n that makes it extremely easy. But let's first start by analyzing the existing approaches for it together with their problems, to later introduce the library and all the goodies that you get from it.

✔ Read More...

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Friday, August 26, 2016

The HTTP protocol is synonymous with modern development. The experienced iOS developer understands and likely works with the popular protocol on a daily basis.

Unsurprisingly, iOS apps are no different in this regard. Thousands of apps and their engineers have trusted the popular AFNetworking library with everything from communicating with servers, parsing JSON, to providing place holder images while the intended ones are still being served up.

In short — it's a tough act to follow. This week, we'll look at the library intended to do just that: Alamofire.

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I've got a pretty slow mobile connection, and often get frustrated when I have to stare at a spinner while I'm waiting for some app to load. A great way to improve this would be to save the loaded content into a persistent store, and display that content on next app launch.

This is how the iOS Weather app works. Try to put your phone into airplane mode and launch the app. You will see that it displays all the data it had the previous time you've launched the app, even though you're not connected to the Internet. This leads to a much better user experience, since you're giving users something to look at other than a spinner.

This is especially good with apps that have feeds from the network, since users can see cool content before more content loads.

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Monday, August 17, 2015

You can convert the decimal value to a human-readable binary representation using the String initializer that takes a radix parameter:

let num = 22

let str = String(num, radix: 2)

println(str) // prints "10110"

If you wanted to, you could also pad it with any number of zeroes pretty easily as well:

func pad(string : String, toSize: Int) -> String {

var padded = string

for i in 0..<toSize - countElements(string) {

padded = "0" + padded

}

return padded

}

let num = 22

let str = String(num, radix: 2)

println(str) // 10110

pad(str, 8) // 00010110

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The above function makes use of Swift tuples to return three values at once. You destructure the tuple using the let (var, ...) syntax or can access individual tuple members, if need be.

If you actually need to print it out with the words Hours etc then use something like this:

func printSecondsToHoursMinutesSeconds (seconds:Int) -> () {

let (h, m, s) = secondsToHoursMinutesSeconds (seconds)

println ("\(h) Hours, \(m) Minutes, \(s) Seconds")

}

Note that the above implementation of secondsToHoursMinutesSeconds() works for Int arguments. If you want a Double version you'll need to decide what the return values are - could be (Int, Int, Double) or could be (Double, Double, Double). You could try something like:

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Easy way of conversion in swift is using constructor of particular type.

Like if you want to get Float from double then you can use Float(doubleValue) and Same way if you want to convert float to integer then you can use Int(floatValue).

Like:

let intValue = UInt8(doubleValue)

Beware that you will loose number after decimal point. So, choose a better way. Above conversion is just to help you in understanding.

Note that Swift always chooses Double (rather than Float) when inferring the type of floating-point numbers.

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1) ViewDidLoad - Whenever I'm adding controls to a view that should appear together with the view, right away, I put it in the ViewDidLoad method. Basically this method is called whenever the view was loaded into memory. So for example, if my view is a form with 3 labels, I would add the labels here; the view will never exist without those forms.

2) ViewWillAppear: I use ViewWillAppear usually just to update the data on the form. So, for the example above, I would use this to actually load the data from my domain into the form. Creation of UIViews is fairly expensive, and you should avoid as much as possible doing that on the ViewWillAppear method, becuase when this gets called, it means that the iPhone is already ready to show the UIView to the user, and anything heavy you do here will impact performance in a very visible manner (like animations being delayed, etc).

3) ViewDidAppear: Finally, I use the ViewDidAppear to start off new threads to things that would take a long time to execute, like for example doing a webservice call to get extra data for the form above.The good thing is that because the view already exists and is being displayed to the user, you can show a nice "Waiting" message to the user while you get the data.

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All these commands are called automatically at the appropriate times by iOS when you load/present/hide the view controller. It's important to note that these methods are attached to UIViewController and not to UIViews themselves. You won't get any of these features just using a UIView.

There's great documentation on Apple's site here. Putting in simply though:

ViewDidLoad - Called when you create the class and load from xib. Great for initial setup and one-time-only work.

ViewWillAppear - Called right before your view appears, good for hiding/showing fields or any operations that you want to happen every time before the view is visible. Because you might be going back and forth between views, this will be called every time your view is about to appear on the screen.

ViewDidAppear - Called after the view appears - great place to start an animations or the loading of external data from an API.

ViewWill/DidDisappear - Same idea as WillAppear.

ViewDidUnload/ViewDidDispose - In Objective C, this is where you do your clean-up and release of stuff, but this is handled automatically so not much you really need to do here.

The UIViewController lifecycle is diagrammed here:

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The sibling views are ordered back to front in the subviews array. So the topmost view will be:

[parentView.subviews lastObject];

and bottom view will be:

[parentView.subviews objectAtIndex:0];

[parentView bringSubviewToFront:view] will bring the view to the top, but this is only the case if the views are all siblings in the hierarchy.

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Wednesday, August 12, 2015

Apple has done some optimization in both Xib and Storyboard files. And because of this optimization, you can now define an IBOutlet as strong, instead of weak. Apple pointed this out at the last WWDC, so let's give a look at this in more details. You can find in the documentation the chapter Managing the Lifetimes of Objects from Nib Files:

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Monday, August 10, 2015

Programming languages don't die easily, but development shops that cling to fading paradigms do. If you're developing apps for mobile devices and you haven't investigated Swift, take note: Swift will not only supplant Objective-C when it comes to developing apps for the Mac, iPhone, iPad, Apple Watch, and devices to come, but it will also replace C for embedded programming on Apple platforms.

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Friday, August 7, 2015

Have you ever wished that your phone could show your location inside a large building like a shopping mall or baseball stadium? Sure, GPS can give you an idea of which side of the building you are in. But good luck getting an accurate GPS signal in one of those steel and concrete sarcophaguses. What you need is something inside of the building to let your device determine its physical location. Enter iBeacons! In this iBeacons tutorial you'll create an app that lets you register known iBeacon emitters and tells you when your phone has moved outside of their range. The use case for this app is attaching an iBeacon emitter to your laptop bag, purse, or even your cat's collar — anything important you don't want to lose. Once your device moves outside the range of the emitter, your app detects this and notifies you. To continue with this tutorial, you'll need to test on a real iOS device and an iBeacon. If you don't have an iBeacon but have a second iOS device, you might be able to use it as a beacon; read on!

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In the early days of iOS, tools to facilitate testing were not a major focus of Apple's Developer Tools team. This has gradually changed over the years with the introduction of the XCTest framework and, more recently, support for asynchronous and performance testing. With Xcode 7 and Swift 2, Apple is taking another big leap to improve testing in Xcode. In this tutorial, I'm going to walk you through three significant additions that will make testing easier and more enjoyable.

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Thursday, August 6, 2015

In general, I prefer NSNotification to KVO and (especially) to bindings. I do use KVO sometimes — there are times when it's the most sensible thing. But NSNotification, like many older APIs, is easier to use without crashing.

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Custom gesture recognizers delight users by making apps feel unique and alive. If basic taps, pans, and rotations are the utility and pickup trucks of the iOS world, custom gesture recognizers are the flashy hot rods with custom paint jobs and hydraulics. Read this custom UIGestureRecognizer tutorial and learn all about gesture recognizers! In this tutorial you'll take a fun little "find the differences" game and make it interactive by adding a custom circle gesture recognizer to select the non-matching image. Along the way you'll learn:

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